10 _clock{clockType}, _targetPeriod{targetFrequency.toCycleDuration()}
17 _clock{clockType}, _targetPeriod{targetPeriod}
24 _clock{clock}, _targetPeriod(targetPeriod)
34 _nextCheckpoint += _targetPeriod;
42 _nextCheckpoint = _clock.
now() + _targetPeriod;